Find the unit tangent vector T and the principal unit normal vector N. r(t) = (ln(cos t) + 3)i + 6j + (4 + t )k, -?/2 < t < ?/2
A. T = (sin t)i - (cos t)k; N = (cos t)i - (sin t)k;
B. T = (-sin t)i + (cos t)k; N = (-cos t)i + (sin t)k
C. T = (sin t)i + (cos t)k; N = (cos t)i - (sin t)k
D. T = (-sin t)i + (cos t)k; N = (-cos t)i - (sin t)k
Answer: D
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Where 
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